Import patches-unapplied version 1:4.3-4ubuntu1 to ubuntu/artful-proposed

Imported using git-ubuntu import.

Changelog parent: ffb494dcedef500f4d565f46db3c5f748ac8c7f1

New changelog entries:
* Merge from Debian unstable. Remaining changes:
- debian/patches/0005-add-fstime.patch: add -fstime to unsquashfs to
extract the fs superblock information and -fstime to mksquashfs to set
the fs superblock time on create. This is needed to support Ubuntu
Store unpack and repack checks for snappy v2 snaps.
* Dropped changes, included in Debian:
- debian/patches/0006-uptream-fix-race.patch: apply upstream git de03266
to fix race in the filesystem finalization

New changelog entries:
* Merge from Debian unstable. Remaining changes:
- debian/patches/0005-add-fstime.patch: add -fstime to unsquashfs to
extract the fs superblock information and -fstime to mksquashfs to set
the fs superblock time on create. This is needed to support Ubuntu
Store unpack and repack checks for snappy v2 snaps.
* Dropped changes, included in Debian:
- debian/patches/0006-uptream-fix-race.patch: apply upstream git de03266
to fix race in the filesystem finalization